/* style.v1.css - neuralnetworks.me */

/* ========== Reset & Base ========== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --color-bg: #ffffff;
    --color-surface: #f5f5f5;
    --color-border: #e0e0e0;
    --color-text: #1a1a1a;
    --color-text-muted: #666;
    --color-accent: #0077b6;
    --color-accent-hover: #005a8c;
    --font-main: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    --font-mono: 'SF Mono', 'Fira Code', 'Consolas', monospace;
    --max-width: 900px;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 2rem;
    --spacing-xl: 4rem;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--color-accent-hover);
}

/* ========== Header & Navigation ========== */
header {
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-md) var(--spacing-lg);
    background-color: var(--color-bg);
    position: sticky;
    top: 0;
    z-index: 100;
}

nav {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-family: var(--font-mono);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-text);
}

.logo:hover {
    color: var(--color-accent);
}

nav ul {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
}

nav ul a {
    color: var(--color-text-muted);
    font-size: 0.95rem;
}

nav ul a:hover,
nav ul a.active {
    color: var(--color-text);
}

/* ========== Main Content ========== */
main {
    flex: 1;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-lg);
    width: 100%;
}

/* ========== Hero Section ========== */
.hero {
    padding: var(--spacing-lg) 0;
}

.hero-content {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-lg);
}

.hero-text {
    flex: 1;
}

.hero-image {
    flex-shrink: 0;
}

.hero-image img {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--color-border);
}

.hero h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.highlight {
    color: var(--color-accent);
}

.tagline {
    font-family: var(--font-mono);
    color: var(--color-text-muted);
    font-size: 1rem;
    margin-bottom: var(--spacing-lg);
}

.intro {
    font-size: 1.1rem;
    max-width: 600px;
    margin-bottom: var(--spacing-lg);
}

/* ========== Buttons ========== */
.cta-buttons {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: 4px;
    font-size: 0.95rem;
    font-weight: 500;
    transition: all 0.2s ease;
}

.btn-primary {
    background-color: var(--color-accent);
    color: #ffffff;
}

.btn-primary:hover {
    background-color: var(--color-accent-hover);
    color: #ffffff;
}

.btn-secondary {
    border: 1px solid var(--color-border);
    color: var(--color-text);
}

.btn-secondary:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

/* ========== Sections ========== */
section {
    margin-bottom: var(--spacing-xl);
}

section h2 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text);
}

.page-header {
    margin-bottom: var(--spacing-xl);
}

.page-header h1 {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
}

.page-header p {
    color: var(--color-text-muted);
}

/* ========== Projects Section ========== */
.projects-section {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.projects-section h2 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-lg);
}

.projects-section h3 {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-sm);
}

/* ========== Project Cards ========== */
.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.project-card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: var(--spacing-lg);
    transition: border-color 0.2s ease;
}

.project-card:hover {
    border-color: var(--color-accent);
}

.project-card h3,
.project-card h2 {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-sm);
}

.project-card p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    margin-bottom: var(--spacing-md);
}

.project-card-full {
    margin-bottom: var(--spacing-xl);
}

.project-description {
    margin-bottom: var(--spacing-md);
}

.project-stats {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--color-accent);
    margin-bottom: var(--spacing-md);
}

.project-links {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

/* ========== Project Details ========== */
.project-details {
    margin-top: var(--spacing-lg);
}

.project-details h3 {
    font-size: 1.1rem;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.project-details h3:first-child {
    margin-top: 0;
}

.project-details p {
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
}

.project-details ul {
    margin-left: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.project-details li {
    margin-bottom: var(--spacing-sm);
}

.detail-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-md);
}

.detail-column h4 {
    font-size: 0.95rem;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
}

.detail-column ul {
    margin-left: var(--spacing-md);
}

/* ========== Tags ========== */
.tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.tags span {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    padding: 0.25rem 0.5rem;
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    color: var(--color-text-muted);
}

/* ========== Skills Section ========== */
.skills-section {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--color-border);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
}

.skill-category h3 {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-sm);
}

.skill-category p {
    font-size: 0.95rem;
    color: var(--color-text);
}

/* ========== Social Links ========== */
.social-links {
    display: flex;
    gap: var(--spacing-lg);
}

.social-links a {
    font-size: 1rem;
}

/* ========== Contact Page ========== */
.contact-content {
    max-width: 600px;
}

.contact-methods {
    display: grid;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.contact-item h2 {
    font-size: 1rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-sm);
}

.contact-item p {
    font-size: 1.1rem;
}

.contact-note {
    color: var(--color-text-muted);
    border-left: 2px solid var(--color-border);
    padding-left: var(--spacing-md);
}

/* ========== 404 Page ========== */
.error-page {
    text-align: center;
    padding: var(--spacing-xl) 0;
}

.error-page h1 {
    font-size: 6rem;
    font-weight: 700;
    color: var(--color-accent);
    line-height: 1;
}

.error-message {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
}

.error-page p {
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-lg);
}

/* ========== CTA Section ========== */
.cta-section {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
    text-align: center;
}

/* ========== Footer ========== */
footer {
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-lg);
    text-align: center;
    background-color: var(--color-bg);
}

footer p {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

/* ========== Blog Index ========== */
.post-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.post-card {
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: var(--spacing-lg);
    transition: border-color 0.2s ease;
}

.post-card:hover {
    border-color: var(--color-accent);
}

.post-card h2 {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-sm);
}

.post-card h2 a {
    color: var(--color-text);
}

.post-card h2 a:hover {
    color: var(--color-accent);
}

.post-meta {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-sm);
}

.post-card p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    margin-bottom: var(--spacing-md);
}

.read-more {
    font-size: 0.9rem;
}

/* ========== Blog Post ========== */
.post-header {
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
}

.post-header h1 {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
}

.post-body {
    max-width: 700px;
}

.post-body h2 {
    font-size: 1.3rem;
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
}

.post-body p {
    margin-bottom: var(--spacing-md);
    font-size: 1.05rem;
    line-height: 1.75;
}

.post-body ul,
.post-body ol {
    margin-left: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.post-body li {
    margin-bottom: var(--spacing-sm);
    font-size: 1.05rem;
    line-height: 1.75;
}

.post-nav {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.post-nav a {
    font-size: 0.95rem;
}

/* ========== Responsive ========== */
@media (max-width: 600px) {
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero-content {
        flex-direction: column-reverse;
        align-items: center;
        text-align: center;
    }
    
    .hero-image img {
        width: 120px;
        height: 120px;
    }
    
    nav {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    nav ul {
        gap: var(--spacing-md);
    }
    
    .cta-buttons {
        flex-direction: column;
    }
    
    .btn {
        text-align: center;
    }
    
    .skills-grid {
        grid-template-columns: 1fr;
    }
    
    .detail-grid {
        grid-template-columns: 1fr;
    }
}

/* ========== Blog Two-Column Layout ========== */
.blog-layout {
    display: grid;
    grid-template-columns: 1fr 260px;
    gap: var(--spacing-xl);
    align-items: start;
}

/* ========== Blog Sidebar ========== */
.blog-sidebar {
    position: sticky;
    top: 80px;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.sidebar-section h3 {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-sm);
}

.sidebar-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.sidebar-links a {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    display: block;
}

.sidebar-links a:hover,
.sidebar-links a.active {
    color: var(--color-accent);
}

.sidebar-posts .sidebar-date {
    display: block;
    font-size: 0.75rem;
    color: var(--color-text-muted);
    font-family: var(--font-mono);
}

/* ========== Tag Cloud ========== */
.tag-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
}

.tag-chip {
    font-size: 0.75rem;
    padding: 0.2rem 0.5rem;
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    color: var(--color-text-muted);
}

/* ========== Post Tags (visible on post) ========== */
.post-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-top: var(--spacing-sm);
}

.post-tags .tag-chip {
    color: var(--color-accent);
    border-color: var(--color-accent);
    background: transparent;
}

/* ========== Responsive Blog ========== */
@media (max-width: 720px) {
    .blog-layout {
        grid-template-columns: 1fr;
    }

    .blog-sidebar {
        position: static;
        border-top: 1px solid var(--color-border);
        padding-top: var(--spacing-lg);
        order: 2;
    }
}